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11 Feb 2004, 18:13

Everytime the population is double, you multiply by 2
Since there is 5 times 5 minutes in 25 minutes, then the population doubles 5 times or 2^5
Then 2^5 * 2 * 10^6 = 2^6 * 10^6 = 64 * 10^6 = 6.4 * 10*7
C is the answer
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